It has to do with the advetising (how the site makes money) and they (whomever has the banner) dosnt want the words fuck hsit pussy ass dick etc etc written in plain view of their ad. I htink iI explained that right!
Ah so! I think people are so weird. The difference is between typing F**k and Fuck is so marginal I cant believe it quells people who seem to out of their way to be offended. And the same with bleeping a swear-word. Who hears "Mother *BEEP*er!", and is going, "Mother what? The beep has fooled me!"